Currently working to modify old spider clone grip frame into sear pin egrip frame using bare bones supplies . Have already created cheap efficient circuit and can post a diagram for anyone who is interested . Also most of mechanics are done

Well it like a simple solution for a 555 timer , the basic circuit is when the switch is not depressed the n and c of the switch are connected so the capacitor charges , when the switch is depressed the n and o of the switch are connected discharging the capacitor a cross the solenoid the Diode stops the capacitor solenoid circuit from resonating , simply it solves the problem of connecting the battery directly to the switch and solenoid and having the solenoid stay active if the switch is held down which can cause problems for a sear pin gun